It's super easy to set up and start using the Sonuus G2M as it's as easy as plugging in your guitar to your MIDI device and that's basically it. The thing that you'll need to get used to is playing your guitar with it in terms of the MIDI tracking. Overall it plays quite nice for what it does, but it does take some getting used to as in order to properly trigger the MIDI notes you need to play very cleanly. Of course more experienced ax-men will have an easier time with this. It does come with an extensive manual but won't be completely necessary for everyone.
The Sonuus G2M doesn't make any sound of it's own of course, as the sound will only be as good as your MIDI device. That being said, it's a great tool for all sorts of reasons, but the capacity that I use it in is for blending my guitar parts with MIDI sounds. Especially for a guitar solo it can sound really cool to have a synth perfectly doubling your part. There are a lot of ways to use the G2M, this is just one way...
Overall, the Sonuus G2M is an awesome little device for an even better price. At just $100 US, it's worth it for any guitarist to have around for use. It really opens up a lot of doors when it comes to getting cool and interesting sounds with your guitar, not to mention you can record MIDI with your guitar to change sounds later or to turn it into notation. This is definitely more than worth the price!!